clark



N. u; CLARK.

0VERSEAM|NG MACHINE.

Patented Dec. 9,1919.

3 SHEETS-SHEET I- N. D. CLARK. OVERSEAMING MACHINE. APPLICATION FILED Nov. 21. 1916.

1,324,541. v Patented Dec. 9,1919.

3 SHEETS-SHEET 2.

N. D. CLARK, OVERSEAMING MACHINEI' APPLICATION FILED NOV. 21, Isms.

Patented Dec. 9, 1919.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

NELSON D. CLAIR-K, OF CHICAGO, ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, ACOIR-PORATION OF ILLINOIS.

' 'OVERSEAMING-MACHINE.

Application filed November 21, 1916. Serial No. 132,668.

To all whom it may concern 7 Be it known that I, NELSON D. CnARK, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useof supporting the stitch finger around which the threads are laid by the stitch forming mechanism.

An object of the invention is to provide a sewing machine of the above character -.with the stitch finger which is located beneath the material being stitched and which is supported independently of the throat plate or work support on WlIlCh the material rests while it is being stitched.

A further object of the invention is to provide a combined means for supporting the throat plate and the stitch finger, said stitch finger being supported-independently of thethroat plate.

A. still further. object of the invention is to provide combined means for supporting the throat plate and the stitch finger and also a needle guard orloop deflector.

These and other objects will in part be obvious and will in part be hereinafter morefully disclosed. 1 I g In the drawings, which showby way of illustrationof the invention Figure 1 is a view partly insection and partly in front elevation showing a portion of a sewing machine having my improvements applied thereto;

v ,Fig. 2-is a vertical sectional view through the overhanging arm adjacent the needle head and looking toward the needle head;

Fig. 3 is a plan view showing the throat plate, the work support, the stitch finger and the stitch forming elements;

, Fig. 4 is a perspective view of the stitch the loop deflector and the means for supporting the same at the throatplate;

Fig. 5 is a similar view but showing the parts separated and the section ofthe bed plate omitted; and T Fig. 6 is a detail showing the upper end of the supporting post, the stitch finger car- Specification of Letters Patent. Patented Dec 9,1919,

ried thereby and the lo p deflector carried I bythe post. I

Prior to my invention it had been com 111011 to provide a throat plate carrying a stitch finger located beneaththe material and around which the threads are inter locked. It sometimes occurs that the'needle I hole is lmproperly positioned relative to the needle when the throat plate is initially secured in place, thus necessitating the proper shifting of the cloth plate to which i the throat plate is attached and conse quently positioning thestitch finger out of its proper relation tothe needle. The stitch finger may be formed integral with the throat plate or may be attached thereto.

In the latter case, the attaching surface of the plate is sosmall, on account of the feed.

slots that the attaching shankof the finger must also be small. Italso sometimes happens that the stitch finger becomes broken,

requiring either an entirely new throat plate I or a new stitch finger. One of the purposes of the present invention is to provide a rigid support for the stitch finger which is independent of the throat plate and work support, so that the stitch finger may be adjusted or removed and replaced at will.

The sewing machine to which the invention is applied is the ordinary overseaming. machine in which a needle penetrates the fabric while complemental stitch forming devices carry the needle loops orother thread loops around the edge of the materialtoa position where the needle enters said loop, and a stitch finger is located beneath the materialand these thread loops are laid around the stitch, finger. stitch finger isv entirely independent of the throat plate, said throat plate being cut away to form a space for the stitch finger so that the upper faceof the stitch finger is substantially flush with the upper surface of the throat plate. 7

Mounted on the bed, beneath the work support is a supporting post which extends upwardly from the bed andengages the throat plate at the under face thereof 'adjacent the needle opening and serves as a means for supporting the throat plate. The stitch fingeris adjustably' attached to this supporting post so that it may be adjusted or entirely removed from the post and a new stitch finger substituted therefor. A loop deflector is also carried by the. post The which cooperates with the needle in insuring that the loop of needle thread is thrown out properly for the entrance of the cotiperating looper.

Referring more in detail to the drawings, I have shown my invention as applied to a sewing machine consisting of a supporting bed 1, which carries an overhanging arm 2 in which a needle bar 3 reciprocates. This needle bar is reciprocated by a needle lever 5 which is connected to the needle bar by a. link 6. Mounted on the supporting bed is a work support 7 which is provided with a throat plate 8. Said throat plate is formed with a needle opening 9 and slots for the feed dog 10. The throat plate is secured to the cloth plate by suitable screws 11.

Cooperating with the needle beneath the work support, as shown in the drawlngs, 1s a looper 12 which may be a thread carrying looper, and cooperating with this thread carrying looper 12 and also with the needle above the work support is a second looper 13. These loopers operate to enchain their thread loops with the needle thread loops, which enchained loops extend around th e edge of the material. The material, as it is fed to the stitching mechanism, may be trimmed by suitable trimming blades, which are indicated at let in the drawings. The

enchained thread loops are formed around a stitch finger, indicated at 15 in the drawings. The stitch finger operates in the manner well known in the art, to support the thread loops as the stitches are being set and the loops are finally fed ofi from the end of the stitch finger. Located beneath the work support is a stitch finger supporting post consisting of a sleeve 16 and a supporting rod 17 to wh ch said sleeve is secured by means of a clamping screw 18, which extends through a split collar 19 formed integral with the sleeve 16. The rod 17 is threaded at its lower end, as indicated at 20, and this threaded end of the rod engages a. threaded socket in the bed plate 1. The rod, at its lower end, is formed with a groove 21, adapted to receive a. screw driver, that the rod may be readily turned for adjusting the height of the sleeve which is supported thereby. A set screw 22 serves as a means for locking the rod against movement when it is brought to the desired position. A set screw 23 serves to hold the rod and the sleeve 16 in a predetermined adjusted position.

The sleeve 16 is made in two sections. The

lower section 24 carries the split collar 19 and is clamped to the post. The upper section 25 is adjustably attached to the lower section 2 1. Said lower section 24 has a groove 26 in its upper end while the section 25 is formed with a lateral shank 27 adapted to fit in the groove 26. Said shank 27 is formed with a slot 28 adapted to receive a screw 29. The slot 28 is elongated so that a stitch finger beneath the upper section 25 may be adjusted trans versely of the lower section 24 and held in adjusted .positions by the screw 29. The upper section 25 of the supporting sleeve is provided with a groove 30 in its upper end. The stitch finger 15 has a laterally extending shank 31 which fits in the groove 30 and this. shank is provided with an elongated slot 32 adapted to receivea screw 33 which extends into the section 25 of the sleeve and clamps the stitch finger thereto. Secured to the side of the section 25 is a plate 34 which is provided with a fiat upper end 35 and also a vertical groove 36. Said plate is also provided with an elongated vertical slot 37 adapted to receive a screw 38, which is threaded into the section 25. The throat plate has a recess in which the stitch finger is located and said stitch finger forms one wall of the needle opening 9.

The stitch finger is capable of several adjustments, one through the lateral adjustment of the section 25 of the sleeve, another through the adjustment of the stitch finger itself on the sleeve and still another through the angular adjustment of the sleeve 16 around the rod 17 and still another by adjusting the vertical position of the rod 17 in the supporting bed or adjusting the sleeve vertically on the rod. Through these adjustments the stitch finger may be readily placed so as to properly cooperate with the needle and the loopers.

The plate 34 is also adjusted so as to en'- gage the under face of the throat plate and support the same by the flat upper end 35 at the point adjacent the needle. This firmly supports the throat plate against the downward thrust of the presser foot when the feed dog drops. The vertical groove in this plate receives the the needle in its proper path but also causes the needle to throw out its thread loop so that the looper may enter the same.

From the above description it will be apparent that I have provided a supporting post which supports the throat plate from the bed plate of the machine, and I have also provided means for rigidly supporting I the material, entirely independently of the throat plate or the work support. This finger is also supported in a manner whereby it may be adjusted to properly position the same.

Having thus described the invention, what is claimed as new is 1. An overseaining machine including in combination, a work support having a throat plate, a stitch finger located beneath the material, and means beneath the work support for supporting said stitch finger in a fixed position independently of said work support and the throat plate.

2. An overseaming machine including in combination, a Work support having a needle and not only holds throat plate provided with a cutaway portion, a stitch finger located in the cut away portion of the throat plate, and means beneath the work support and independent of the throat plate for supporting said stitch finger in a fixed position.

3. An overseaming machine including in combination, a work support having a throat plate provided with a cut away portion, a stitch finger located in said cut away portion and having its upper face substantially flush with the upper face of the throat plate, and means independent of the throat plate for supporting said stitch finger.

4:. An overseaming machine including in combination, a needle, a work support having a throat plate, a stitch finger, and means independent of said work support and the throat plate for supporting said stitch finger, said means being adjustable transversely of the line of stitching whereby the operative position of said stitch finger may be shifted laterally.

5. An overseaming machine including in combination, a needle, a throat plate having a needle opening and a cut away portion, a stitch finger located in the cut away portion and forming one side of the needle opening, and means independent of the throat plate for supporting said stitch finger.

6. An overseaming machine including in combination, a supporting bed, a work support, a throat plate carried thereby, a stitch finger supported by the bed independently of the work support and located with its upper. face substantially flush with the upper face of the throat plate.

7. An overseaming machine including in combination, a supporting bed, a work support carried by said supporting bed and hav: ing a throat plate, a supporting post carried by the bed and supporting said throat plate, and a stitch finger separate from said throat plate and carried by said supporting post.

8. An overseaming machine including in combination port carried by said supporting bed and having a throat plate, asupporting post carried by the bed and supporting said throat plate," a stitch finger, and meansfor'adjustably attaching said stitch finger to said supporting post whereby the stitch finger may be adjusted and supported with its upper face j substantially flush with the upper face of the throat plate.

9. An overseamin machine including in combination, a need e, a supporting bed, a work support having a throat plate, a post mounted on the bed and supporting said throat plate, a stitch finger carried by said supporting post, and a loop deflector carried by said supporting post and cooperating with said needle. v

' 10. An overseaming machine including in combination, a supporting bed, 'a throat plate, a supporting post comprising a supporting rod, a sectional sleeve carried thereby, a stitch finger carried by said supporting post and having its upper face subthroat plate. e I 11. An overseaming machine including in combination a supporting bed, a throat plate, a supporting post carried by said bed erally thereof, said throat plate having a cut away portion for said stitch finger whereby said stitch finger may be positioned with its upper face substantially flush with the upper face of the throat plate. In testimony whereof in the presence of two Witnesses.

NELSON D. CLARK.

Witnesses:

S. GEORGE TATE, E. G. N. Tnnsrsn.

I aflix my signature 7o stantially flush with the upper face of the y 

